Open Question
2 Mg(s) + O2(g) → 2 MgO(s) ΔH = −1204 kJ
8. Thermochemistry
Endothermic & Exothermic Reactions
Back8. Thermochemistry
Endothermic & Exothermic Reactions
- Open Question
Identify which of the following is true for the reaction N2(g) + 3 H2(g) → 2 NH3(g)
- Open Question
Which has greater energy in an exothermic reaction, the reactants or the products?
- Open Question
What would likely happen if you were to touch the flask in which an endothermic
- Open Question
What type of process occurs when solidified wax is converted to liquid wax on heating?
- Open Question
An (a) __________ reaction liberates heat and the temperature of the reaction mixture increases.
- Open Question
The normal freezing point of n-octane (C8H18) is -57 °C. (a) Is the freezing of n-octane an endothermic or exothermic process?
- Multiple ChoiceTwo compounds were dissolved in water and mixed together. A precipitate formed, and the test tube got very warm. Based on this information, which of these statements is true?
- Multiple Choice547 J of thermal energy is added to a 200.0 g sample of iron that is initially at 68.0 °C. If the specific heat capacity of iron is 0.449 J/g°C, what will be the final temperature in °C?
- Multiple ChoiceA 1.720 g sample of naphthalene (C10H8) undergoes combustion in a bomb calorimeter, causing the temperature to rise from 24.00°C to 47.57°C. If the heat capacity of the calorimeter is 2940 J/°C, what is the enthalpy of combustion of naphthalene in kJ/mol?
- Multiple ChoiceA 100.0 mL sample of 0.300 M NaOH is mixed with a 100.0 mL sample of 0.300 M HNO3 in a coffee cup calorimeter. If both solutions were initially at 35.00°C and the temperature of the resulting solution was recorded as 37.00°C, determine the ΔH°rxn (in kJ/mol) for the neutralization reaction.
- Multiple ChoiceA 25.0 g piece of aluminum (which has a molar heat capacity of 24.03 J/mol °C) is heated to 85.1 °C and dropped into a calorimeter containing water (specific heat capacity of water is 4.18 J/g °C) initially at 25.0 °C. Assuming no heat is lost to the surroundings, what is the final temperature of the system?
- Multiple ChoiceAfter adding the NaOH to the H2SO4 solution, the temperature of the mixture increases to 32.5°C. What type of reaction is occurring in the coffee cup?
- Multiple ChoiceWhen 100.0 mL of 0.200 M CsOH is mixed with 50.0 mL of 0.400 M HCl in a calorimeter, the temperature increases from 22.50 °C to 24.28 °C. What type of reaction is occurring?
- Multiple ChoiceWhen 100.0 mL of 0.200 M KOH is mixed with 50.0 mL of 0.400 M HNO3 in a calorimeter, the temperature increases from 22.50 °C to 24.32 °C. What type of reaction is occurring?